The history of the Earth can be traced back 4.6 billion years.

Imagine putting some major events of Earth history on a timeline.

Click on the box on the timeline where you think each event should appear, starting with the appearance of the first dinosaurs.

Earth courtesy of NASA; Cyanobacteria © J. William Schopf; Bothriolepis © UCMP; Eoraptor © DigiMorph.org; T. rex by Dave Smith, © UCMP; Human skull clip-art.